en>Brien.givens: Further simplified the code and fixed and error in the random selection of the pivotIndex

2013-12-10T21:26:47Z

Further simplified the code and fixed and error in the random selection of the pivotIndex

New page

{{Starbox begin
| name = 99 Aquarii
}}
{{Starbox image
| image =
<div style="position: relative">[[File:Aquarius IAU.svg|250px|alt=Diagram showing star positions and boundaries of the Aquarius constellation and its surroundings]]
<div style="position: absolute; left: 27.0%; top: 58.7%;">[[File:Cercle rouge 100%.svg|12px]]</div>
</div>
| caption = Location of 99 Aquarii (circled)
}}
{{Starbox observe
| epoch = J2000
| ra = {{RA|23|26|02.78566}}<ref name=aaa474_2_653/>
| dec = {{DEC|–20|38|31.251}}<ref name=aaa474_2_653/>
| appmag_v = 4.37<ref name=mnras172_667/>
| constell = [[Aquarius (constellation)|Aquarius]]
}}
{{Starbox character
| class = K4 III<ref name=houk1978/>
| b-v = +1.431<ref name=mnras172_667/>
| u-b = +1.815<ref name=mnras172_667/>
| variable = Suspected<ref name=gcvs2001/>
}}
{{Starbox astrometry
| radial_v = +15.7<ref name=gcsrv/>
| prop_mo_ra = –50.72<ref name=aaa474_2_653/>
| prop_mo_dec = –64.22<ref name=aaa474_2_653/>
| parallax = 11.51
| p_error = 0.21
| parallax_footnote = <ref name=aaa474_2_653/>
| absmag_v =
}}
{{Starbox detail
| mass =
| radius = 33<ref name=lang2006/>
| luminosity =
| temperature = 3980<ref name=apjss74/>
| metal_fe = –0.20<ref name=apjss74/>
| gravity = 1.66<ref name=apjss74/>
| rotational_velocity =
| age_myr =
}}
{{Starbox catalog
| names=b02 Aquarii, [[Bonner Durchmusterung|BD]]–21 6420, [[Henry Draper Catalogue|HD]] 220704, [[Hipparcos catalogue|HIP]] 115669, [[Bright Star Catalogue|HR]] 8906, [[New Catalogue of Suspected Variable Stars|NSV]] 14554, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 191900.<ref name=SIMBAD/>
}}
{{Starbox end}}

'''99 Aquarii''' is the [[Flamsteed designation]] for a [[star]] in the [[celestial equator|equatorial]] [[constellation]] of [[Aquarius (constellation)|Aquarius]]. The [[Bayer designation]] for this star is b<sup>2</sup> Aquarii. It is visible to the naked eye with an [[apparent visual magnitude]] of 4.37;<ref name=mnras172_667/> according to the [[Bortle Dark-Sky Scale]] this is bright enough to be seen even from city skies under ideal viewing conditions. Based upon [[parallax]] measurements, the distance to this star is around {{Convert|283|ly|pc|abbr=off|lk=on}}.<ref name=aaa474_2_653/>

This is a [[giant star]] with a [[stellar classification]] of K4 III.<ref name=houk1978/> It is a suspected [[variable star]] that apparently ranges in magnitude between 4.35 and 4.45.<ref name=gcvs2001/> The measured [[angular diameter]] of this star is {{nowrap|3.55 ± 0.21 [[milliarcsecond|mas]]}}.<ref name=aaa431_773/> At the estimated distance of Delta Ophiuchi,<ref name=aaa474_2_653/> this yields a physical size of about 33 times the [[Solar radius|radius of the Sun]].<ref name=lang2006/> The [[stellar atmosphere|outer atmosphere]] has an [[effective temperature]] of 3980 K,<ref name=apjss74/> giving it the orange-hued glow of a cool, [[K-type star]].<ref name=csiro/>

This star was a candidate member of the [[Ursa Major Moving Group]] based on the work of American astronomer [[Nancy Roman]], but this membership is now in question.<ref name=aaa451_3_909/>

==References==
{{reflist|refs=

<ref name=aaa474_2_653>{{citation | first=F. | last=van Leeuwen |date=November 2007 | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 | postscript=. |arxiv = 0708.1752 }}</ref>

<ref name=apjss74>{{citation | last1=McWilliam | first1=Andrew | title=High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances | journal=Astrophysical Journal Supplement Series | volume=74 | pages=1075–1128 |date=December 1990 | doi=10.1086/191527 | bibcode=1990ApJS...74.1075M | postscript=. }}</ref>

<ref name=houk1978>{{citation | last1=Houk | first1=Nancy | title=Michigan catalogue of two-dimensional spectral types for the HD stars | volume=4 | publication-place=Ann Arbor | publisher=Dept. of Astronomy, University of Michigan | year=1978 | bibcode=1988mcts.book.....H | postscript=. }}</ref>

<ref name=gcsrv>{{citation | last=Wilson | first=Ralph Elmer | year=1953 | title=General Catalogue of Stellar Radial Velocities | publisher=Carnegie Institution of Washington | location=Washington | bibcode=1953QB901.W495..... | postscript=. }}</ref>

<ref name=mnras172_667>{{citation | last1=Jennens | first1=P. A. | last2=Helfer | first2=H. L. | title=A new photometric metal abundance and luminosity calibration for field G and K giants. | journal=Monthly Notices of the Royal Astronomical Society | volume=172 | pages=667–679 |date=September 1975 | bibcode=1975MNRAS.172..667J | postscript=. }}</ref>

<ref name=SIMBAD>{{citation | title=99 Aqr -- Variable Star | work=SIMBAD Astronomical Object Database | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=99+Aquarii | accessdate=2012-07-11 | postscript=. }}</ref>

<ref name=aaa431_773>{{citation | last1=Richichi | pages=A. | last2=Percheron | first2=I. | last3=Khristoforova | first3=M. | title=CHARM2: An updated Catalog of High Angular Resolution Measurements | journal=Astronomy and Astrophysics | volume=431 | pages=773–777 |date=February 2005 | doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R | postscript=. }}</ref>

<ref name=lang2006>{{citation | first1=Kenneth R. | last1=Lang | title=Astrophysical formulae | volume=1 | series=Astronomy and astrophysics library | edition=3 | publisher=Birkhäuser | year=2006 | isbn=3-540-29692-1 | url=http://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41 | postscript=. }}. The radius (R<sub>*</sub>) is given by:
:<math>\begin{align} 2\cdot R_*
& = \frac{(87\cdot 3.55\cdot 10^{-3})\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\
& \approx 66\cdot R_{\bigodot}
\end{align}</math></ref>

<ref name=csiro>{{citation | title=The Colour of Stars | date=December 21, 2004 | work=Australia Telescope, Outreach and Education | publisher=Commonwealth Scientific and Industrial Research Organisation | url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html | accessdate=2012-01-16 | postscript=. }}</ref>

<ref name=gcvs2001>{{citation | display-authors=1 | last1=Samus | first1=N. N. | last2=Durlevich | first2=O. V. | last3=Kazarovets | first3=E. V. | last4=Kireeva | first4=N. N. | last5=Pastukhova | first5=E. N. | last6=Zharova | first6=A .V. | last7=et al | title=NSV 14554 | work=General Catalog of Variable Stars |date=March 2012 | url=http://www.sai.msu.su/gcvs/cgi-bin/ident.cgi?cat=HD++&num=220704 | accessdate=2012-07-12 | postscript=. }}</ref>

<ref name=aaa451_3_909>{{citation | last1=Chupina | first1=N. V. | last2=Reva | first2=V. G. | last3=Vereshchagin | first3=S. V. | title=Kinematic structure of the corona of the Ursa Major flow found using proper motions and radial velocities of single stars | journal=Astronomy and Astrophysics | volume=451 | issue=3 | pages=909–916 |date=June 2006 | doi=10.1051/0004-6361:20054009 | bibcode=2006A&A...451..909C | postscript=. }} See table 7.</ref>

}}

==External links==
* [http://aladin.u-strasbg.fr/AladinPreview?-c=23+26+02.7861-20+38+31.251&ident=NSV+14554&submit=Aladin+previewer Image 99 Aquarii]

{{Stars of Aquarius}}

[[Category:Flamsteed objects|Aquarii, 99]]
[[Category:Bayer objects|Aquarii, b2]]
[[Category:Henry Draper Catalogue objects|220704]]
[[Category:Aquarius (constellation)]]

Quickselect - Revision history

en>Brien.givens: Further simplified the code and fixed and error in the random selection of the pivotIndex